CODEWITHSUNDEEP
opencvcmake
Akshay Hazari
Akshay Hazari

Reputation: 3267

Linking OpenCV with cmake . Adding the installation prefix of "OpenCV" to CMAKE_PREFIX_PATH doesn't work

I am trying to create the script to compile and run as mentioned by emscirpten.

This is the command I wish to create a cmake file for.

./emcc -std=c++11 -O3 -I.. ~/DLIB/dlib-19.4/dlib/all/source.cpp  -I/home/akshay/DLIB/dlib-19.4 -I/usr/include/X11/ -lpthread -lX11 -lopencv_imgcodecs  -o webca.js  ~/DLIB/dlib-19.4/examples/webcam_face_pose_ex.cpp -ldlib  `pkg-config opencv --cflags --libs`

So far I have come up with this. This is my CMAKELists.txt file. 

cmake_minimum_required(VERSION 3.5.1)
project(DLIB)
SET(CMAKE_BUILD_TYPE_INIT "Release")
set(CMAKE_CXX_STANDARD 11)
if (${CMAKE_SYSTEM_NAME} MATCHES "Emscripten")
    set(CMAKE_C_COMPILER "emcc")
    endif ()

if(NOT DEFINED OpenCV_PREFIX)
  set(OpenCV_PREFIX ${CMAKE_INSTALL_PREFIX})
  endif()

set(CMAKE_VERBOSE_MAKEFILE on)
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/build.emscripten)

set(DLIB_SRC "/home/akshay/DLIB/dlib-19.4/examples/webcam_face_pose_ex.cpp")
add_library(DLIB_static ${DLIB_SRC})
set(OpenCV_PREFIX /usr/share/OpenCV/OpenCVConfig.cmake)

include_directories(/usr/include/X11 /home/akshay/DLIB/dlib-19.4 /home/akshay/DLIB/dlib-19.4/dlib/all/source.cpp)

set_target_properties(DLIB_static PROPERTIES LINK_FLAGS "-s DEMANGLE_SUPPORT=1 --preload-file assets --bind")
find_package(PkgConfig REQUIRED)

find_package(OpenCV REQUIRED  
    PATHS ${OpenCV_PREFIX}/lib/cmake/
    ${OpenCV_PREFIX}/share/OpenCV/
      NO_DEFAULT_PATH)
find_library(OpenCV REQUIRED     PATHS ${OpenCV_PREFIX}/lib/cmake/
    ${OpenCV_PREFIX}/share/OpenCV/
      NO_DEFAULT_PATH)

set(CMAKE_REQUIRED_FLAGS "-std=c++11 -O3 -lpthread -lX11 -lopencv_imgcodecs -ldlib `pkg-config opencv --cflags --libs`")

#file(GLOB_RECURSE CORE_HDR src/.h)
#file(GLOB_RECURSE CORE_SRC src/.cpp)

add_definitions("-s DEMANGLE_SUPPORT=1 --preload-file ${CMAKE_SOURCE_DIR}/assets --bind")
add_executable(DLIB /home/akshay/DLIB/dlib-19.4/examples/webcam_face_pose_ex.cpp)

When I run this command :cmake -DCMAKE_PREFIX_PATH=/usr/share/OpenCV/OpenCVConfig.cmake -DCMAKE_BUILD_TYPE=Debug -G "Unix Makefiles" -DCMAKE_TOOLCHAIN_FILE=/home/akshay/Downloads/emsdk-portable/emscripten/1.37.16/cmake/Modules/Platform/Emscripten.cmake . && make

It gives me an error like so :

CMake Error at CMakeLists.txt:25 (find_package):
  Could not find a package configuration file provided by "OpenCV" with any
  of the following names:

    OpenCVConfig.cmake
    opencv-config.cmake

  Add the installation prefix of "OpenCV" to CMAKE_PREFIX_PATH or set
  "OpenCV_DIR" to a directory containing one of the above files.  If "OpenCV"
  provides a separate development package or SDK, be sure it has been
  installed.

It seems to not be able to find the CMAKE_PREFIX_PATH or that I am not setting it correctly.

I have just started fiddling around with CMAKE since yesterday. I may have very little clue about what I have done. Have tried some of the other SO answers as well.

Any help will be appreciated

Upvotes: 1

Views: 5380

Answers (1)

Elvis Dukaj
Elvis Dukaj

Reputation: 7368

You simply need to set the OpenCV_DIR to the path where OpenCV is installed, for example:

cmake -DOpenCV_DIR=/usr/local/share/OpenCV ..

Upvotes: 2

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